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I am having trouble with the rear defogger. It lights up in the front when I press the button but there is no heat at the back window. The fusebox in the rear seat houses the fuse, but it is a minirelay. If that was blown would it not light up in the front? And can I just pull those out of the box and how expensive are they. Help.
 

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You Can Use A Test Light To Verify Current To The Grid Lines. The Light Should Turn On Dimly Then Increase In Brightness As You Gently Pull It Across The Line. Each Line Should Be Checked For Continuity, Visably Check For A Broken Grid Line. Usually It Is One Of The Side Plug In Connectors That Come Un Soldered Or Disconnected. Auto Parts Stores Carry A Kit To Repair The Grid Lines . Very Rare To Have A Relay Fail. Also The On Light At The Dash Will Still Come On If There Is An Open Circuit At The Glass. Good Luck.
 
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